Thanks for voting and commenting on this issue. Your feedback is key to helping us understand how you use admin.atlassian.com, so we can continue improving your experience. We have reviewed this issue over the last few days; however there are not currently any plans to implement bulk edit/delete for users in our admin.atlassian.com UI.
Since this request was first created, user management has become much more complex. Many of our customers use external user directories and are in need of APIs to achieve similar updates to many users at once. Therefore, we will be focusing on delivering some APIs to help customers achieve this. Once these have been delivered, we'll reassess our priorities in relation to building bulk actions into our UI.
I understand that our decision may be disappointing. I'll make another update on this ticket when we have plans for adding bulk actions into our UI.